Subfloor flatness is a critical requirement for both luxury vinyl and laminate flooring installations. Most manufacturers define a specific tolerance, such as 3/16 inch of deviation over a 10-foot span. If the subfloor does not meet these requirements, the floor will fail. High spots can lead to localized pressure, which causes the locking joints to break or peak, while low spots create areas where the flooring flexes under traffic, eventually leading to joint separation and structural failure of the locking system. To ensure a successful installation, use a long straightedge to identify any high or low spots in your subfloor. High spots must be sanded or ground down, and low spots should be filled with a high-quality, cementitious patching compound. Proper surface preparation is the foundation of a durable floor; ignoring this step is a leading cause of installation complaints and warranty denials. Even if you are installing over a seemingly flat wood subfloor or concrete slab, taking the time to verify flatness will pay off in a level, stable floor that performs exactly as intended.
Key considerations
- floor flatness for LVP
- laminate subfloor tolerance
- prepare uneven floor for vinyl plank
- subfloor flatness
- LVP installation
- laminate installation